• 전기학회논문지P
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• 제61권3호
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• pp.111-115
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• 2012

Generally, brushless DC motor(BLDCM) driving system uses hall sensors or encoders as the mechanical position or speed sensor. It is necessary to achieve the informations of rotor position for driving trapezoidal type brushless DC motor without any position sensor. In this paper, the commutation signals are obtained without the motor neutral voltage, multistage analog filters, A/D converters, or the complex digital phase shift circuits which are indispensable in the conventional sensorless control algorithms. In the proposed method, in stead of detecting the zero crossing point of the nonexcited motor back electromagnetic force for the average motor terminal to neutral voltage, the commutation signal are extracted directly from the specific average line to line voltage with low-pass filter, adder and comparators circuit. In contrast to conventional methods, the neutral voltage is not need; therefore, the commutation signals are insensitive to the common mode noise. Moreover, the complex phase shift circuit can be eliminated. The effectiveness of the proposed method is verified through simulation results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.521-522
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• 2016

This paper presents a novel scheme to estimate the rotor position of a single-phase hybrid switched reluctance motor (HSRM). The proposed method uses the differential of back-EMF within a position region to estimate rotor position. By detecting the crossing-zero signal of back-EMF differential value, the minimum position of back-EMF corresponding to an absolute rotor position can be captured and used for position estimation four times in every mechanical rotation. In this way, a sensorless operation with adjustable turn on/off angle can be achieved without substantial computation. For the starting, two current comparators are adopted. The experimental verification using a prototype drive system is provided to demonstrate the viability of the proposed sensorless scheme.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.134-136
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• 2008

In recent years, the switched reluctance motor have been used many industrial application because of its cost advantage. SRM drivers are accomplished by switching the phase currents on and off synchronously with the rotor position which is fed back to the controller by position may deteriorate in harsh environments and increase the size and cost of the SRM drive system. This paper proposes a position sensorless method that is based on impressed pulse voltage using impressed at unenergised phases to estimate the rotor position. The current value by impressed pulse voltage compare with the threshold value. The rotor position can be estimated by observing the current value. Finally, simulation results compare with the sensor type SRM and confirm the proposed method to be useful.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.33-35
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• 2005

We propose an improved sensorless drive method of Switched Reluctance Motors using impressed voltage pulses. Conventional impressed voltage pulse method has a problem of phase delay because of low -pass filter. So In this paper we propose an unproved sensorless driving method based on the impressed voltage pulse using new phase-shift circuit technique that overcomes the phase delay and start-up problem.

• Journal of Power Electronics
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• 제9권1호
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• pp.117-123
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• 2009

This paper presents a sliding mode observer for the sensorless control of interior permanent magnet synchronous motor (IPMSM) drives. The sliding mode observer has been presented as a robust estimation method. Most of these previous works, however, were not for an interior PMSM (IPMSM), but for a non-salient pole PMSM and its observer design is conducted in the stationary reference frame. Thus, in this paper, we investigate the design of a sliding mode observer and its driving characteristics for an IPMSM. The proposed sliding mode observer is designed in the rotating reference frame, and good drive performance is achieved even when the observer parameters are mismatched with those of an actual motor. The proposed method is applied to a 600W IPMSM, and, then, the measurement results are presented.

• Journal of Power Electronics
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• 제12권5호
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• pp.748-757
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• 2012

In a sensorless control system with a Permanent Magnet Synchronous Motor (PMSM), the angular position of the rotor flux can be estimated by a voltage equation. However, the estimated angle may be inaccurate due to various causes. In this paper, it was comprehensively analyzed how various causes affect the angle error. As a result of the analysis, an error equation intuitively describing these relationships was derived. The parameter errors of a PMSM and the non-ideal properties of the driving system were identified as error-causing factors. To demonstrate the validity of the error equation, PMSMs were tested at various operating points. The variations in angle errors could be well explained with the error equation.

• 전력전자학회논문지
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• 제6권3호
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• pp.223-230
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• 2001

구형파 브러시리스 직류전동기를 구동시키기 위해서는 전동기의 회전자 위치에 대한 정보를 아는 것이 필수적이다. 본 논문에서는 회전자 위치를 검출하기 위해 일반적으로 사용되는 홀센서나 엔코더를 이용하지 않고, 각 상을 저항으로 Y결선하여 만들어지는 단자의 전압에 포함되어 있는 비여자상의 역기전력을 이용하여 전동기의 회전자 위치를 검출하는 구형파 브러시리스 직류전동기용 센서리스 드라이브 시스템을 제안한다. 이를 위해 3상 2여자 선단부 유니폴라 PWM을 수행할 결우에 대한 각상의 단자전압 분석을 수행하고, 분석된 단자전압 파형으로부터 회전자 위치를 검출하는 방법을 제안한다. 그리고 이를 실제로 간단한 회로로 구현하였다. 실험에 사용된 전동기는 100W급이며 Power MOSFET으호 인버터를 구성하였으며 87c196mc 컨트롤러를 사용하여 제어기를 구성하였다.

• 전력전자학회논문지
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• 제13권1호
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• pp.63-69
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• 2008

구형파 BLDC (Brushless DC) 전동기를 구동시키기 위해서는 전동기의 회전자 위치에 대한 정보를 아는 것이 필수적이다. 본 논문에서는 회전자 위치를 검출하기 위해 일반적으로 사용되는 홀센서나 엔코더를 이용하지 않고 각상을 저항으로 Y결선하여 만들어지는 단자의 전압에 포함되어 있는 역기전력을 클램프 회로를 통한 필터회로를 이용하여 전동기의 회전자 위치를 검출하는 구형파 BLDC 전동기를 위한 센서리스 드라이브 시스템을 제안한다. 특히 본 논문에서 제안한 새로운 역기전력 증폭 제한 회로를 통한 필터회로를 구성하여 저속영역에서 센서리스를 특성을 개선하였다. 그리고 이를 실제로 100[W]급 BLDC 구동용 프로토 타입 드라이브를 제작하여 제안된 역기전력 증폭 제한 회로의 타당성 검증하였다.

• 전기학회논문지P
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• 제57권3호
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• pp.244-249
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• 2008

This paper deals with speed control of DC servo motor using a Fuzzy tuning observer. Speed sensor detect a speed of rotor continuously. But it have a limit as a driving speed to detect speed precisely. So it is problem to improve the performance of the driving system. To solve the problem, it is studied to detect a speed of DC motor without sensor. In particular, study on the method to estimate the speed using the observer is performed a lot. In this parer, the gain of the observer is properly set up using the fuzzy observer. The fuzzy observer has a superior transient characteristic and is easy to implement compared the existing method is designed. It estimate the derivative of the armature current directly using the armature current measured in the DC motor. It estimate the speed of the rotor using the differentiation. It is proposed speed sensorless control method using the estimated speed. Optimal gain of Luenberger observer is set up using the fuzzy observer and adapted speed control of DC servo motor low speed operation. It is proved excellence and feasibility of the presented observer from the comparison tested a case with a speed sensor and a case without a speed sensor which used a highly efficient drive and 200W DC servo motor starting system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2203-2205
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• 2003

In this thesis, it is a purpose to carry out speed control of DC servo motor without using encoder and the resolver which are speed sensor of DC servo motor and it should use estimate algorithm or observer and must assume a speed in order to control speed sensorless. Therefore, high gain observer was designed to estimate rotor speed of DC servo motor and it carries out speed control from the feedback of the speed that assumed done in the thesis. Also, implementation used easy PI controller in speed-controller of DC motor though it was simple. It is compared estimate performance of Luenberger and high gain observer in a way of computer simulation in order to verify performance of the high gain observer which proposed in this thesis, and proved excellency of the high gain observer. And the thesis proved that smooth speed sensorless control of DC servo motor was implemented in invariable driving.